Abstract
Comparison of literature data on effective interfacial areas from sulfite oxidation and CO 2 absorption into alkali show considerable differences even for the same contactor. It is shown that the discrepancy results from the use of an overall conversion. Owing to the non-linear dependency of the conversion of the interfacial area and the non-uniformity of the τ/ d b -values of the bubbles this is not permitted. The deviation of a chem from a geo is larger the broader the distribution of τ/ d b and the higher the Stanton numbers are. The error can however be kept low if area measurements by chemical methods are carried out at low conversions, i.e. the gas—liquid contactor should possibly be operated as differential reactor. For a difference of a chem from a geo less than 15% the conversion in the smallest bubbles having largest τ/ d b -values should not exceed a value of about 0.4–0.8, the appropriate value depending on the reaction order. This presents a rather conservative guideline for efficient experimentation, however, it guarantees negligible difference of a chem from a geo for most practical applications.
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